import java.util.Scanner;

public class demo2 {
    public demo2() {}
    public static void main(String[] args) {
        System.out.println("*************************");
        System.out.println("****微型计算器          ***");
        System.out.println("****1.求和             ***");
        System.out.println("****2.求差             ***");
        System.out.println("****3.求积             ***");
        System.out.println("****4.求商             ***");
        System.out.println("****5.求余             ***");
        System.out.println("****Q.退出             ***");
        System.out.println("*************************");
        Scanner sc = new Scanner(System.in);
        System.out.println("请选择算法：");
        String number = sc.next();
        switch(number) {
            case "1":
                System.out.println("请输入第一个数");
                double num1 = sc.nextDouble();
                System.out.println("请输入第二个数");
                double num2 = sc.nextDouble();
                System.out.println("求和结果为：" + (num1 + num2));
                break;
            case "2":
                System.out.println("请输入第一个数");
                double num3 = sc.nextDouble();
                System.out.println("请输入第二个数");
                double num4 = sc.nextDouble();
                System.out.println("求和结果为：" + (num3 - num4));
                break;
            case "3":
                System.out.println("请输入第一个数");
                double num5 = sc.nextDouble();
                System.out.println("请输入第二个数");
                double num6 = sc.nextDouble();
                System.out.println("求和结果为：" + (num5 * num6));
                break;
            case "4":
                System.out.println("请输入第一个数");
                double num7 = sc.nextDouble();
                System.out.println("请输入第二个数");
                double num8 = sc.nextDouble();
                System.out.println("求和结果为：" + (num7 / num8));
                break;
            case "5":
                System.out.println("请输入第一个数");
                double num9 = sc.nextDouble();
                System.out.println("请输入第二个数");
                double num10 = sc.nextDouble();
                System.out.println("求和结果为：" + (num9 % num10));
                break;
            case "Q":
                break;

        }

    }
}